How to Use APC UPS with Two or More Computers - Master Slave Setup

In a previous post it was described how to
setup and monitor a UPS dedicated to your Ubuntu workstation computer (STANDALONE mode).

There is also another post about the use of
apcupsd, an Open Source solution to monitor
your APC UPS, which is connected to your Ubuntu
workstation computer (STANDALONE mode).

In some cases you want your UPS to protect more than one computer (MASTER-SLAVE mode). apcupsd is a great solution
in case of APC UPS. In my
case, I use an APC UPS ("APC Back UPS BR1500GI RS 1500VA (LI)")
which is physically connected via USB with an Ubuntu file and backup server (host name atlas, IP
192.168.1.52 - the MASTER computer). But I also want my UPS to protect my Ubuntu workstation (host
name athena, IP
192.168.1.51 - the SLAVE computer).

It is very important the network switch to be powered by the UPS (so the apcupsd NIS
server to be
functional in case of outage).

See the graph in the top of the article, which describes my hardware setup.

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